heres something to pick your brains....bent my rails today

[Studder]

Ya. A overheated powder coating process on alum can alter strength for sure, but would have to be excessive. Have safe trip home boys.

 

[OOC ZigZag]

Early season rides can be costly. I know how tough it can be to hold back but hey until the base is there and a bunch of cushion on top no jumpin.:d

 

[maxwell]

Early season rides can be costly. I know how tough it can be to hold back but hey until the base is there and a bunch of cushion on top no jumpin.:d

Sorry man my sled never left the ground so don't be sayin that. I also know how to land a jump. I wouldn't post this if it was my own dumbazz fault. Usually if you botch a jump it bends the rails so bad its not rideable. You can see from my photos it didn't take much force to do this

 

[OOC ZigZag]

Sorry man my sled never left the ground so don't be sayin that. I also know how to land a jump. I wouldn't post this if it was my own dumbazz fault. Usually if you botch a jump it bends the rails so bad its not rideable. You can see from my photos it didn't take much force to do this

Just sayin if there was more snow do you think it would have happened. Possibly not enough snow ontop of rocks creek crossings ect yet? Both the skids on todays posts were they both Iceage? possibly a defective skid or 2 ? Easy man didn't say you couldn't ride. Guess your a little sour I would be to if my skid was bent like that. I'm going to try the C3 setup and see how it works.:d

 

[CATPRIDE]

That sure is a big bag of bird seed...........JS

 

[Polarblu]

oh snap....polarblu is gonna have a field day with this. those rails don't look any stronger than stock right in the center where they are bent, that sucks dude.

LMAO ya i will. Ice age should know better than to stop the rienforcment before the CRUCIAL pivot point. This has been demonstrated in sleds for years!!! See pics!!
even Rig welders can see where the stress is pointed!!!!!

 

[MrHankey]

That sure is a big bag of bird seed...........JS

was thinking the exact same thing

 

[heavy d]

that's gay........

 

[shoppingcart111]

Well from a metalurgical standpoint with me being a metalurgist, I cant remember the exact temp for aluminum when it gets to its austinitic point (change in metal structure) but when they bake powder coating at 387ishºF range, this is way below the point that affects the material change in aluminum. It would have to been left in the oven at a way higher temp for a hell of a long time to weaken the structure. I've had tons of aluminum stuff done including sportbike wheels which is powdercoating was going to affect them I would never do it (Dont want a motorcycle wheel braking at 200+km) and have never had a problem. I have a buddys thats a powder coater and have never heard of a problem occuring from the bake.

Take some better close up pics at the bend point if you dont mind, from the ones you posted there doesnt seem to be any stresses in the coating at the bend point which makes me thing they were bent during the manufacturing process.

 

[flabbajabba]

possible. except i pulled my sled off my deck. lol

Off to the ground or off-down the ramp? We bent a set of Doo rails first ride last year in Allen. Lots of creeks,never left the ground etc. The best we could come up with was when unloading we pulled it off the trailer 3' ish onto the hard parking lot? kind of got dropped off the trailer onto the tail so we thought it was fluke. Could have been the creeks as well there is no way you crossed the EXACT way/place/speed as the other sled. (not that I think it had anything to do with it but they were powdercoated the other two that weren't bent were not)

 

[maxwell]

Well from a metalurgical standpoint with me being a metalurgist, I cant remember the exact temp for aluminum when it gets to its austinitic point (change in metal structure) but when they bake powder coating at 387ishºF range, this is way below the point that affects the material change in aluminum. It would have to been left in the oven at a way higher temp for a hell of a long time to weaken the structure. I've had tons of aluminum stuff done including sportbike wheels which is powdercoating was going to affect them I would never do it (Dont want a motorcycle wheel braking at 200+km) and have never had a problem. I have a buddys thats a powder coater and have never heard of a problem occuring from the bake.

Take some better close up pics at the bend point if you dont mind, from the ones you posted there doesnt seem to be any stresses in the coating at the bend point which makes me thing they were bent during the manufacturing process.

i will get some but there is no stresses in the metal or the powdercoating. its a very minor bend at that center point that is amplified to the back. i was looking at some pics from the build and they were straight then. i also tensioned my track and it was very loose when i got back to the truck. so i did bend them on that ride.

 

[maxwell]

Off to the ground or off-down the ramp? We bent a set of Doo rails first ride last year in Allen. Lots of creeks,never left the ground etc. The best we could come up with was when unloading we pulled it off the trailer 3' ish onto the hard parking lot? kind of got dropped off the trailer onto the tail so we thought it was fluke. Could have been the creeks as well there is no way you crossed the EXACT way/place/speed as the other sled. (not that I think it had anything to do with it but they were powdercoated the other two that weren't bent were not)

ya i thought about that but one person was on the back and i was pushing on the front off the sled deck. very slowly. couldnt be that. i could see that if i pinned it off backwards forsure.

 

[maxwell]

Just a thought, could your drop brackets been to big? that way all the pressure would be on the back half.

stock brackets

 

[heavy d]

A MUST READ

Powder Coating:<br>Cure Cycle Affects Aluminum?s Properties - Feature Articles - Paint and Coatings Industry

Just the opening couple of paragraphs

 

[takethebounce]

I have read a few threads on people bending the IceAge rails before on the XP's.

Maxwell I tried searching DT to see the posts and who it was but I know there are a few guys on there who won't use them anymore.

 

[teeroy]

A MUST READ

Powder Coating:<br>Cure Cycle Affects Aluminum?s Properties - Feature Articles - Paint and Coatings Industry

Just the opening couple of paragraphs

got an error trying to open the link, but found the article on google. excerpt:

We are a job shop that was asked to powder coat billet aluminum parts for a customer. The customer asked if the cure cycle will affect the physical properties of the billet aluminum?

Yes, the cure cycle can adversely affect the strength of the material. Peak substrate temperatures should be below 300°F--ideally 275°F. Aluminum billet material and/or alloys change crystal structure at about 410°F. The crystalline realignment at 410°F causes the previous ductile aluminum to become brittle.

The Aluminum Association Inc. describes it this way: Heating aluminum alloys above 275°F causes granular rearrangement of the metallurgical structure resulting in a significant change of bulk properties. Essentially, the tensile strength of the metal is dramatically lowered, much like a stress relief anneal on a steel piece would do.

Consequently, the resultant substrate is not as strong, nor will pressure vessels made of such treated aluminum (e.g., scuba tanks) hold near the pressure that they were originally rated for.

link http://www.pcimag.com/Articles/Feature_Article/4b901878aa187010VgnVCM100000f932a8c0____

 

[maxwell]

 

[Longhairfreak]

The only thing I can think of is lightening track speed that bent them.

 

[shoppingcart111]

I haven't seen a powder coating oven go over 410 F and if it did then yes there would be problems, plus when the crystal sturcture changes for aluminum it becomes brittle as the article says, so if those rails where heated to long they would of fractured or stress cracked not bent.

 

[teeroy]

I haven't seen a powder coating oven go over 410 F and if it did then yes there would be problems, plus when the crystal sturcture changes for aluminum it becomes brittle as the article says, so if those rails where heated to long they would of fractured or stress cracked not bent.

in layman's terms, what does it say in the second paragraph about heating over 275 degrees? changing the ductile strength etc....